I have a 2008 QC with the stock 7 speaker infinity system. For now all I want to do it put in a jl 250/1 and a jl12w3v2 in a single 12" fox box. My questions is how should I hook the amp up to get signal. Should I hook it up to one of the front speakers via a line out converter? Also, if I do this and turn down my bass level to take away bass from my 6x9's in the doors will this also reduce bass going to the sub?
You just need to use a test light to figure out what wire is getting powered when radio is turned on for remote wire or spot labeled REM on amp
Hook up + on sub to + on amp and - on sub to - on amp I would bridge them so they pound harder by connecting far left + and far right - (then do not use the middle two) these could be mirrored but you should get the idea
it will look like below depending on how many channels your amp has
+ - + -
then find what wires are L and R in factory plug and hook up a line converter that will make the wires into RCA. Hook those into left and right on the amp RCA's labeled in
Then of course run a positive lead wire from the battery and ground the amp somewhere under the seat
BOOM amped up
I have no idea what level you are in this so I hope this clear enough without sounding like I was dumbing it down just trying to make it easy
I will try and figure out what color wires are what on your year and get back to you. I am not sure if mine is the same as I have '09